#include<stdio.h>
#include<string.h>
#include<stdlib.h>

int main(int argc, char* argv[], char *env[]){
  (void)argc;
  (void)argv;
  (void)env;

  const char* who = getenv("USER");
  if(who == NULL) return 1 ;
  if(strcmp(who, "wgm") == 0){
    printf("正常使用程序的逻辑\n");
  }
  else{
    printf("Only wgm!\n");
  }
  return 0;
}
